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Rollup merge of #75366 - GuillaumeGomez:help-button, r=jyn514

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Add help button

Part of #75197.

Here is a screenshot of the result:

![Screenshot from 2020-08-10 16-53-20](https://user-images.githubusercontent.com/3050060/89796547-14112a00-db2a-11ea-9f25-57b30ab68f9b.png)

r? @jyn514
This commit is contained in:
Dylan DPC 2020-08-11 01:56:43 +02:00 • committed by GitHub
commit 51ed33d8c2
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6 changed files with 27 additions and 11 deletions
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4
src/librustdoc/html/static/main.js
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@ -473,7 +473,9 @@ function defocusSearchBar() {
}());
document.addEventListener("click", function(ev) {
if (hasClass(ev.target, "collapse-toggle")) {
if (hasClass(ev.target, "help-button")) {
displayHelp(true, ev);
} else if (hasClass(ev.target, "collapse-toggle")) {
collapseDocs(ev.target, "toggle");
} else if (hasClass(ev.target.parentNode, "collapse-toggle")) {
collapseDocs(ev.target.parentNode, "toggle");